12. Loosen jam nut (A).
13. Turn adjuster screw (B) clockwise (screw in) to
decrease knife speed, and counterclockwise (screw
out) to increase the knife speed.
NOTE:
One turn of the adjuster screw (B) will change the knife
speed by approximately 116 strokes per minute (spm),
or the knife drive box pulley speed by 58 revolutions per
minute (rpm).
14. Once adjustment has been made, torque jam nut (A).
15. Close hood, start engine, and recheck knife speed.
Figure 4.192: Knife Speed Adjuster Screw
Setting Knife Speed (Without Expansion Module MD #B4666)
1. Check header knife drive box pulley speed with a
handheld tachometer.
2. Multiply the rpm reading by 2 to obtain the knife speed
in strokes per minute.
3. Compare reading to Table
.
4. If required, adjust knife speed. Refer to step
Knife Speed (With Expansion Module MD #4666
Installed), page 183
.
Figure 4.193: Knife Drive Box on Header
169890
184
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